Gas removal from deep-bed filters
US3970555A · kind A · utility
4Cited by
7References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 10, 1975 |
| Grant date | Jul 20, 1976 |
| Priority date | — |
| Expiry date | Nov 10, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2201/085
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Gas bubbles, and in particular nitrogen gas bubbles, generated during the denitrification of treated wastewater in a deep-bed filter are removed by venting them from a level below the surface of the filter bed. Gas removal may be enhanced by introducing pressurized air or water into the lower portion of the filter bed to dislodge the gas bubbles from the filter media and drive them upward where they can be vented to the atmosphere. Alternatively, pressurized air or water may be introduced into a vent pipe located below the surface of the filter bed to drive the gas bubbles up through the surface of the filter bed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.